Inside HS2's longest tunnel

Two enormous Tunnel Boring Machines (TBMs) excavating HS2’s longest tunnels have completed the first stage of their drive – from the Chiltern tunnel’s south portal to the first ventilation shaft at Chalfont St Peter.

Join TBM Civil Engineering Apprentice Caitlyn on a tour through HS2's Chiltern Tunnel to see the latest progress as our two giant tunnel boring machines (TBMs), Florence and Cecilia, create the tunnel.

The two machines have now completed around 20% of their journeys under the Chilterns and have arrived at the first of five ventilation shafts that are being constructed along the 10-mile tunnel.

The Chiltern tunnel will take HS2 underneath the hills and safeguard the woodlands and wildlife habits above ground as well as significantly reducing disruption to communities during construction and operation of the new railway.

A crew of 17 people on board each machine keep them running, working in shifts and supported by over 100 people on the surface, managing the logistics and maintaining the smooth progress of the tunnelling operation.

To find out more visit www.hs2.org.uk/chiltern-tunnel.

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If you have a question about HS2 or our works, please contact our HS2 Helpdesk team on 08081 434 434 or email [email protected].